Spring anchor and pivot pin lock



INVENTQR. THOMAS D. MANTLE ATTORNEY FIGS.

T. D. MANTLE SPRING ANCHOR AND PIVOT PIN LOCK Flled Jan 30 1950 April 21, 1953 Patented Apr. 21, 1953 SPRING ANCHOR AND PIVOT PIN LOCK Thomas D. Mantle, Normandy, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application January 30, 1950, Serial No. 141,298

1 Claim.

This invention relates to pivotal supports for levers and consists particularly in a novel combination biasing spring and pivot pin locking device.

The type of automotive fuel pump now generally in use has a reciprocating diaphragm actuated by a pivoted lever held yieldingly in engagement with a cam rotated by the engine so as to intermittently actuate the pumping diaphragm in the charging direction and release the diaphragm for yielding actuation in the discharge direction by a compression spring bearing against the diaphragm. The operating 1ever is customarily held in engagement with the cam by a coiled spring which bears against the lever at one side of the pivotal supporting pin. Various means have been provided for locking the pin in position. However, I have found that this object may be accomplished more simply and less expensively than heretofore by forming an integral extension on the lever biasing spring which embraces an annular recess on the pin, and thus holds both the spring and pin in position.

Accordingly, the main object of the present invention is to provide novel means, as in a pump of the above type, for simplifying and decreasin the cost of the mean for anchoring a pivoting lever and its supporting pin.

This object and other more detailed objects hereafter appearing are attained by the structure illustrated in the accompanying drawing in which:

Fig. 1 is a side view and section illustrating an automotive fuel pump embodying the invention;

Fig. 2 is an enlarged detail showing the operating 1ever, its pivotal support, and the lever biasing spring;

Fig. 3 is a side view of the lever biasing spring disassembled;

Fig. 4 is an end view of the lever biasing spring;

Fig. 5 is a view of the pivotal pin disassembled.

The fuel pump in Fig. 1 comprises a body I including the fuel connections, fuel valves, and various dome structures which do not constitute the present invention. A right angle housing ll extends from the fuel pump body and has a flange l2 at its inner end for attachment to the engine (not shown). Clamped between housing I I and the fuel pump body is a diaphragm l3 having a stem I4 secured centrally thereto by means of large washers l and I6. Pump operating lever ll, of inverted U section, is pivotally supported in housing I I upon a pin l8 journalled in bearing bosses l9 formed in the legs of the lever. The lever extends inwardly beyond housing I l for engagement with the operating cam (not shown) and, at its opposite end, underlies a pad 20 on stem I4 for one-way actuation of the stem in the direction to move diaphragm 13 in the charging direction. A coiled spring 2| is compressed between a shoulder 22 in housing I I and upper cup washer IS on the diaphragm for urging the diaphragm in the pump discharge direction. The space around stem l4 within shoulder 22 is sealed by a flexible diaphragm 23.

Lever I! is constantly urged in the clockwise direction, for causing its free, inner end to bear against the operating cam, by mean of a coiled compression spring 25 which has a seat 25 in the interior of the housing and bears eccentrically against the under surface of lever H. The upper end coil of spring 25, which engages the lever, is extended, as at 21, in approximate S shape and has a hook 28 embracing an annular recess 29 in pin i8. The sides of the recess constitute longitudinal shoulders cooperating with hook 28 to maintain the pin and spring 25 properly aligned. Thus, lateral displacement and play between the lever and pivot pin are resisted, while extension 21 also serves to stabilize the sealing of spring 25 against lever H.

The details of the fuel pump are not essential and may be modified in variou ways. These and other modifications as occur to those skilled in the art may be made without departing from the spirit of the invention and the exclusive use of al1 modifications as come within the scope of the appended claim is contemplated,

I claim:

The combination of a pivoting lever with a journal bearing, a pivotal pin journalled in said bearing and having an annular recess, and a coiled compression spring projecting laterally from said lever and with an end coil axially bearing against and biasing said 1ever, the wire of said end coil being extended to and embracing said pin at said recess so as to resist relative lateral displacement of said lever and said pin while stabilizing the relationship of said spring and said lever.

THOMAS D. MANTLE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,505,405 Mohun Aug. 19, 1924 1,710,139 Barrows Apr. 23, 1929 1,728,433 Mohun Sept. 17, 1929 2,369,535 Cofiey Feb. 13, 1945 2,463,659 Tiedman Mar. 8, 1949 2,468,673 Kaminky Apr. 26, 19-19 

